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- E. A. BARBET METHOD '05 REMOVING TAR FROM THE vAPoRs ARISING ERQMjTHE CARBONI'ZATION 0F wow Filed 001:. 20. 1921' IlZ/UQZZiZl Prensa 31. 92 1598.547

; UNITED STATES PATENT OFFICE.

EMILE AUGUSTIN BARBET, OF PARIS, FRANCE.

mnrnon or nnmovme ran FROM THE vAroRs ARISING rnom THE CARBONIZATION or woon.

Application flled October 20, 1921, Serial No. 509,117, and in France October 21, 1920.

The hot and acid gases from the retorts means of a steam coil S immersed in the in wood distillation contain a somewhat tar at the lower part of A through which conslderable proportion of tars. Thesetars body of tar the gases entering the apparatus -must be eliminated as completely as possible first pass. The tar entirely freed from v 6 in order to obtain acetate of lime of sufacetic acid is finally discharged through the 60 ficient purity to meet the requirements of overflow pipe B; the market, The vapor not condensed in passes to For this purpose, use is made of contin-' the eflicient coolers connected to C (not uous tarremoving "apparatuses, various shown). In these coolersall of the vapors 10 types of which have been described in my are condensed forming aliquid containing 6 prior Patent 1,371,461. acetic acid, a small quantity of insoluble This invention is an important improve-1 creosote-oil, water and methyl alcohol. This ment in the process of removing tar from liquid must be amber colored but not yelthe gasesin question by means of which it low. If it was too much colored, that is is possible to obtain an acetate of lime to say tarry, the volume of cold water in 7 reaching a' purity of 85 and 86% which the condenser C would be increased, in ordoes,.not need to be fritted in order to burn der to increase slightly the volume of the out tars. reflux liquid d, but however, without lower- The invention will be described further ing the temperature of the thermometer with reference to the accompanying draw- T beyond 90 C. 4

ing illustrating a suitable apparatus shown It is desirable to draw off from time to in elevation. time, through the cock B, a sample of the Inthe drawing A represents the tar rereflux liquid in order to control its color moving tower having a variable number of and its composition. v splash plates of any suitable construction, One might operate in a slightly different many ty es being known in the art. The manner. The vapors passing through 6 are caps of t ese plates must be of a type capacaused to enter one or more coupled con-' ble of being easily cleaned. The moist den'sers, capable of cooling the gases down wood gases containing pyroligneous acid to 30 to 40 C. and consequently free them vapors enter at the bottom through the pipe of nearly all the condensable vapors. The 35 a. These gases have a temperature between cock R would serve to'draw off about'three- 120 and 115? C. They pass through the fourths of the condensed liquid, in order to plates and issue at the top through the pipe allow the remaining quarter to enter the" b at a temperature of about 100 C. apparatus A. The color of the liquid e lmy 35 These gases and vapors pass thence into drawn oil would tell whether the cock R a water condenser 0, adapted to condense was to be opened or closed thus regulating only a small portion of the vapors, that is to the amount of liquidreturned to A.

say the vapors having the greatest densi- Y Satisfactory results may thus be obtained, ties, i. e. tars, creosote oils, acetic acid, water, but however the first method is the best, I

l and traces only of alcohol. The gases, issuas in the second method, the reflux liquid is ing' from the condenser must still have a both too coldand-too rich in methyl alcotemperature of about 65 to 75 C. They hol; the apparatus A is in danger of being pass from this condenser into a series of cooled down to too low atemperature or, efiicient coolers which complete the cooling the volume of the reflux liquid has to be of the gases. restricted too much for effecting the satis- A portion of the liquid which is confactory removal of the tars. t

dense in C flows back through the pipe I claim 2- 1 d on the upperv plate of A and condenses 1. A process for removin tar from pyroor scrubs the tars and the less volatile maligneous vapors from woo distillation re- 50 terials, and causes them to pass down to torts comprising assing said vapors into 1 the lower part of A. The methyl alcohol counter current ow with a condensate and acetic acid are revaporized so that the formed from said vapors, removing the un-' tar itself is freed from acetic acid as it condensed vapors, partially condensing said passes down from plate to plate. The re unoondensed vapors to remove substantially M moval of the aceticacid is completed by all the tar therefrom, adding condensate thus formed to the first mentioned condensate.

2. A process for removing tar from pyroligneous vapors from wood distillation retorts comprising passing such vapors in contact with successive portions of condensate formed from said vapors, said condensate being successively and increasingly poor in tar, removing the uncondensed vapors, partially condensing said uncondensed vapors to remove substantially all the tar therefrom and thus to form a condensate poor in tar and substantially free of methyl alcohol, adding condensate thus formed to one of said portions relatively poor in tar.

3. A process for removing tar from pyroligneous acid vapors from Wood distillation retorts which comprises passing said vapors into a rectifying column, heatin .the condensate formed at the bottom oi said column gvithdrawing vapors from said column, partially condensing said withdrawn vapors and introducing condensate thus formed as a reflux into said column.

4:. A process for removing tar from pyroligneous acid vapors from wood distillation retorts Which'comprise's passing said vapors into a rectifying column, heating condensate thus formed in the bottom' of said column to a temperature suflicient to exhaust said condensate of acetic acid, removing the vapors from said column,-partially condensing said removed vapors at a temperature suflicient to condense acetic acid in said vapors but insuificient to condense any material amount of methyl alcohol contained in said vapors, returning the condensate thus formed as a reflux to said column.

In testimony I have signed my name to this specification.

EMILE AUGUSTIN BABBET. 

